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利用光纤光栅的反射特性和光纤耦合器的耦合特性,研究基于光纤光栅辅助耦合波分复用(WDM)下话路器。满足国际电信联盟(ITU-T)建议波长的WDM光信号从耦合器输入端口进入,其中与光栅中心反射波长一致的激光信号从耦合器的下话路端口输出,而其他波长的激光信号从耦合器输出端口输出,实现特定波长信号的下话路。选择中心波长分别为1554.248 nm,1555.859 nm,消光比为57 dB的两路光信号进行试验,光纤光栅的中心反射波长为1555.86 nm,实验结果表明,上述两路光信号分别从不对称光纤耦合器的输出端口和下话路端口输出,且在下话路端口输出光信号的消光比为48 dB。
Based on the reflection characteristics of fiber grating and the coupling characteristics of the fiber coupler, the fiber coupler based on the WDM coupler is studied. WDM optical signals meeting the ITU-T recommended wavelengths enter from the coupler input port, where a laser signal coincident with the grating center reflected wavelength is output from the coupler’s down-talk port and the other wavelengths of laser signal are transmitted from the coupling The output of the device output port, to achieve the specific wavelength signal of the next road. Two optical signals with central wavelengths of 1554.248 nm, 1555.859 nm and extinction ratio of 57 dB were selected for experiment. The center wavelength of the FBG was 1555.86 nm. The experimental results show that the two optical signals are transmitted from the asymmetric fiber coupler Of the output port and the next port output, and in the next port output optical signal extinction ratio of 48 dB.